Abstract: A resource allocation method and an apparatus for mitigating inter-cell interference in the heterogeneous cellular communication system are provided. The method for a first type base station to allocate resource in a wireless communication system including the first and second types base stations according to the present invention includes estimating an available Frequency Assignment (FA) not used by a neighbor second type terminal among FAs used by the first type base station, and allocating sub-channels associated with one of the available FAs not used by the neighbor second type terminal to a first type terminal, wherein the second type base station allocates the sub-channels for uplink and downlink transmissions of the second type terminal over a predetermined time period such that an FA in which sub-channels for the uplink transmissions are allocated and the FA in which sub-channels for the downlink transmissions are allocated are the same.

Abstract: The present invention relates to a method and apparatus for updating a key for encrypting multicast data in a wireless communication system. The method of the present invention is characterized by comprising: an information receiving step of receiving information on a group entry time and a group exit time from users who have newly entered an arbitrary group including at least one subgroup; a grouping step of grouping the users using the information on the group entry time and the group exit time; and a key transmission step of either transmitting, to the newly-entered users, keys related to the group and the subgroups, or updating, for the remaining users of the subgroups, both the key related to the subgroup to which the user exiting the group belongs and the key of the group and then transmitting the updated keys to the users of the subgroups.

Abstract: A resource allocation method and an apparatus for mitigating inter-cell interference in the heterogeneous cellular communication system are provided. The method for a first type base station to allocate resource in a wireless communication system including the first and second types base stations according to the present invention includes estimating an available Frequency Assignment (FA) not used by a neighbor second type terminal among FAs used by the first type base station, and allocating sub-channels associated with one of the available FAs not used by the neighbor second type terminal to a first type terminal, wherein the second type base station allocates the sub-channels for uplink and downlink transmissions of the second type terminal over a predetermined time period such that an FA in which sub-channels for the uplink transmissions are allocated and the FA in which sub-channels for the downlink transmissions are allocated are the same.